Rumman Hussain Siddiqui

@rumman90

Technical Lead at Ain Finance

Karachi, PakistanJoined May 2026

About

Technical Lead and Software Architect focused on distributed systems, microservices, fintech architecture, cloud-native systems, and scalable backend engineering.

Available for

Technical Writing, Freelance Consulting, Open Source Contributions, Speaking at Conferences, Engineering Mentorship and Software Architecture Reviews

Rumman Hussain Siddiqui's blogs

Distributed Systems & Software Architecturerummansystems.hashnode.dev7 posts

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Recently published

RHRumman Hussain Siddiquirummansystems.hashnode.dev4h ago · 13 min read

Testing Index Assumptions Across PostgreSQL, MySQL, SQL Server, and Oracle

I built this experiment because I wanted to check something that comes up often in backend work: an index can look right in a code review, but the database may still choose a different path. That is e

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RHRumman Hussain Siddiquirummansystems.hashnode.devJun 13 · 20 min read

Building a Document Intelligence Platform with NestJS, n8n, and PostgreSQL

A document question-answering system is often reduced to a short pipeline: extract text, split it into chunks, create embeddings, retrieve relevant chunks, and generate an answer. That description is

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RHRumman Hussain Siddiquirummansystems.hashnode.devJun 7 · 7 min read

Blockchain Meets Distributed Systems: The Similarities Most Engineers Overlook

For a long time, I treated blockchain as a completely separate engineering discipline. Whenever someone mentioned blockchain, the conversation immediately shifted to validators, Proof of Work, Proof o

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RHRumman Hussain Siddiquirummansystems.hashnode.devJun 2 · 6 min read

Designing a Resilient Order Fulfillment Architecture with Saga Pattern, RabbitMQ, Redis, and SQL Server

Modern order processing systems rarely exist as a single application. As systems evolve, order management, inventory, payment processing, fulfillment, shipping, and customer notifications are often se

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RHRumman Hussain Siddiquirummansystems.hashnode.devMay 24 · 7 min read

Designing a Scalable Crypto Wallet Architecture That Handles Retries, Ledger Integrity, and Distributed Failures

Building wallet systems looks simple at first. Most tutorials stop at: create wallet deposit funds withdraw funds But once financial consistency, retries, concurrency, and distributed failures en

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Rumman Hussain Siddiqui

About

Available for

Rumman Hussain Siddiqui's blogs

Recently published

Testing Index Assumptions Across PostgreSQL, MySQL, SQL Server, and Oracle

Building a Document Intelligence Platform with NestJS, n8n, and PostgreSQL

Blockchain Meets Distributed Systems: The Similarities Most Engineers Overlook

Designing a Resilient Order Fulfillment Architecture with Saga Pattern, RabbitMQ, Redis, and SQL Server

Designing a Scalable Crypto Wallet Architecture That Handles Retries, Ledger Integrity, and Distributed Failures

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Rumman Hussain Siddiqui

About

Available for

Rumman Hussain Siddiqui's blogs

Recently published

Testing Index Assumptions Across PostgreSQL, MySQL, SQL Server, and Oracle

Building a Document Intelligence Platform with NestJS, n8n, and PostgreSQL

Blockchain Meets Distributed Systems: The Similarities Most Engineers Overlook

Designing a Resilient Order Fulfillment Architecture with Saga Pattern, RabbitMQ, Redis, and SQL Server

Designing a Scalable Crypto Wallet Architecture That Handles Retries, Ledger Integrity, and Distributed Failures